Kampala, Uganda: Tens of thousands of Tanzania's ethnic Maasai people are homeless after the government burnt their houses to keep the savannah open for tourism benefiting two foreign safari companies, a US-based policy think-tank claims.

Villagers in northern Tanzania's Loliondo area, near the Ngorongoro Crater tourism hotspot, have been evicted in the past year and denied access to vital grazing and watering holes, said the new report by the Oakland Institute, a California think-tank that researches environmental and social issues.

Tourists drive in safari vehicles to get a view of a female lion in Mikumi National Park, Tanzania. Credit:AP

"As tourism becomes one of the fastest-growing sectors within the Tanzanian economy, safari and game park schemes are wreaking havoc on the lives and livelihoods of the Maasai," said Oakland Institute's Anuradha Mittal. "But this is not just about a specific company - it is a reality that is all too familiar to indigenous communities around the world."

Allegations of wrongdoing have persisted in recent years against Tanzania Conservation Limited, an affiliate of US-based Thomson Safaris, and Ortello, a group that organises hunting trips for the royal family of the United Arab Emirates.