More than 100 elephants have died in two months in Botswana's Chobe National Park due to drought, which has also affected wildlife in other countries in the region, the government said on Tuesday.

Several southern African countries are enduring one of the worst droughts in decades, caused by months of over-average temperatures and erratic rainfall.

The drought has wilted grasslands and dried up water holes, making it increasingly difficult for animals to survive.

Botswana's environment ministry said it has recorded a spike in the number of elephant and other animal deaths since May.

"More than one hundred elephants are estimated to have died naturally in the past two months," the ministry said in a statement, adding that 13 deaths were recorded just this week.