Simon identified this most extraordinary tree - thank you very much, Simon! Here additional information by google:

Baobab
The amazing baobab [wiki] (Adansonia) or monkey bread tree can grow up to nearly 100 feet (30 m) tall and 35 feet (11 m) wide.

Their defining characteristic: their swollen trunk is actually water storage – the baobab tree can store as much as 31,700 gallon (120,000 l) of water to endure harsh drought conditions.

Baobab trees are native to Madagascar (it’s the country’s national tree!), mainland Africa, and Australia.
A cluster of "the grandest of all" baobab trees (Adansonia grandidieri) can be found in the Baobab Avenue, near Morondava, in Madagascar:
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