With her husband killed in the ensuing violence, she now lives with her baby in one of Nigeria's 'widow's houses'.

She's one of more than 40.8 million people around the world on the run in their own countries, according to recent figures by the Internal Displacement Monitoring Centre, (IDMC).

Nearly one third of displaced people are on the African continent where 12.4 million people in 21 countries were living in ongoing displacement as a result of conflict and violence at the end of 2015.

A little acknowledged issue, the number of internally displaced people (IDPs) across Africa is more than twice as many as the continent's total refugee population of 5.4 million, which only accounts for those who have crossed national borders.

"We are always flabbergasted at just how little people actually acknowledge this issue," says Alexandra Bilak, Director at IDMC.

"There are twice as many conflict IDPs as there are refugees in the world. The figures are quite staggering, the problem is far bigger."

What is internal displacement?

An internally displaced person is anyone who has been forced to flee their habitual place of residence as a result of conflict, violence, development projects and natural and manmade disasters, regardless of whether or not they are a national of the country, says Bilak, citing the UN Guiding Principles on Internal Displacement

While conflict is the largest cause, natural disasters may also cause the uprooting of communities.

IDMC's statistics currently do not include slow-onset natural disasters, such as drought, as gathering such data is too challenging, Bilak says.

"The figures that we have are related to sudden-onset disasters, such as floods, storms, typhoons, hurricanes and earthquakes -- those that are actually visible -- and when you have a very clear start date."

In Ethiopia for example, drought linked to El Niño and subsequent flooding displaced hundreds of thousands in 2015 and early 2016, many of which fall off the radar when gathering figures on displacement, the report notes.

So far IDMC's data covers only 21 of the 54 African countries, and challenges with accessing reliable data in some cases suggests that the issue is more widespread than is revealed in the report, Bilak says.

1.8m displaced in Nigeria

Nigeria tops the list of African countries with the most new displacements in 2015 when 737,000 uprooted. More recent figures from the International Organization for Migration (IOM) show that the situation is still dire, with 1.8 million people estimated to have been on the move at the end of 2016.

JUST WATCHED On the run in their own country Replay More Videos ... MUST WATCH On the run in their own country 00:59

Here, conflict and violence caused by the Boko Haram insurgency make up more than 90 percent of displacements, according to IOM.

Many have taken refuge in the displacement camps.

"There are huge camps outside the city, with upwards of 35,000 people in each. that are managed by the humanitarian communities such as NGOs and UN partner, with the support of the government," says Julia Burpee, public information officer at IOM, who works with emergency response in the areas surrounding Maiduguri, in Borno state in the northeast of the country, near the border with Cameroon.

Still, around 75% live in host communities, according to IOM.

"Some live in other people's backyards. And you hear of families who left their homes and gave their homes to IDPs."

Photos: Inside Nigeria's internal displacement camps Nearly 1.8 million people are estimated to live in internal displacement in Nigeria, while some 75 percent live in host communities. Many live for years in camps often run by humanitarian organizations. Hide Caption 1 of 10 Photos: Inside Nigeria's internal displacement camps Accessing safe drinking water and toilets is a challenge for those living in camps, where as many as 100 people might share a toilet, according to IOM, whose work involves improving sanitation.

Hide Caption 2 of 10 Photos: Inside Nigeria's internal displacement camps Some of the camps in the northeastern part of the country near the border with Cameroon are home to more than 35,000 people. Often forced to flee their homes in a hurry, some arrive with nothing. Around 90% of internally displaced Nigerians have fled their homes because of the Boko Haram insurgency, according to IOM. Hide Caption 3 of 10 Photos: Inside Nigeria's internal displacement camps "We came empty-handed. Boko Haram took all our things, our cattle and our land. People in Maiduguri have given us some things, but still, we are just managing," Ali Yacana, whose family of 15 live in one of the camps, told IOM. Hide Caption 4 of 10 Photos: Inside Nigeria's internal displacement camps Families have to line up their cans near a bore hole for their daily water collection. Hide Caption 5 of 10 Photos: Inside Nigeria's internal displacement camps Some camps have rehabilitation centers for women who have escaped Boko Haram, which may involve counseling and activities such as pasta-making sessions. Some spent years with the militant group after being abducted from their homes, according to IOM. Hide Caption 6 of 10 Photos: Inside Nigeria's internal displacement camps Others pass the time with embroidery. Fatmata (right), 22, was forced to flee at 5am on a Monday morning when Boko Haram attacked her village. "They started shooting guns and killing people. We ran and ran through the bush and on Tuesday, we reached Maiduguri (about 80 km away)," she told IOM. Hide Caption 7 of 10 Photos: Inside Nigeria's internal displacement camps After food, household items are in highest demand. Pictured here, IOM staff pack aid parcels to be delivered to displaced families across the northeast. Over the last year their kits have reached 160,000 people, according to the organization. Hide Caption 8 of 10 Photos: Inside Nigeria's internal displacement camps The kits include pots, plates, cooking utensils, floor mats, buckets, water purification tablets, soap, reusable sanitary pads, mattresses and blankets. Hide Caption 9 of 10 Photos: Inside Nigeria's internal displacement camps To keep track of the internally displaced people IOM's aid workers use biometrics such as fingerprints. Hide Caption 10 of 10

Idleness and despair inside the camps

Some camps offer informal education and other services.

"They are more like little villages. You see people set up small markets inside the camps, selling food items, salt or condiments."

Others wait idly and despair. Farmers have lost their land and workers their work.

"You see people sitting around idle, without jobs," Burpee says. "There is really stark devastation."

Forced to leave in a hurry, many are dependent on humanitarian aid, Burpee says.

"I've spoken to so many who share the same story. They fled their homes, either at 5am or at 11pm because Boko Haram was already there and they had to escape, or Boko Haram was arriving into their village or town."

"They left with the clothes on their backs and a few things in their pockets."

Many rely on humanitarian aid for food and household products.

Not a refugee, yet

In the eyes of the law the internally displaced are different from refugees. Not having crossed any borders, they remain under the jurisdiction of their state, while refugees fall under international humanitarian refugee laws, Bilak says.

"The problem is that in many cases, specifically in Africa, the state itself has been involved in one way or another in causing the displacement in the first place."

"Their ability to seek protection and assistance from their government is in many cases very limited," she adds.

The IDMC report was launched in collaboration with the African Union in December to coincide with the anniversary of the Kampala Convention , a joint effort by a number of African governments to work towards the protection of internally displaced people which came into force in 2012.

Some of the camps are home to more than 35,000 people

While issues remain, Bilak says it's a positive initiative.

"Africa is the only continent in the world to have adopted a specific normative framework on internal displacement. Of course there are issues with how far it's been implemented and how useful it is as a tool," Bilak says.

"But I think symbolically it's a very important step forward."

20m refugees worldwide

Preliminary IDMC figures for the first half of 2016 show that last year may have seen even more displacement, the report says.

Looking at refugees, the global crisis is seeing an unprecedented surge according to the UNHCR , who estimate that there are currently more than 20 million refugees worldwide.

"Many of the refugees that we see today started off their journeys as IDPs," says Bilak, noting that the issue needs urgent attention before more are forced to leave their countries altogether.

"It requires investment at the root of the problem, which is very much at home."