Landlocked country one, making them the biggest contiguous group in the world. Also, the Central Asian and Caucasian clusters can be considered contiguous, joined by the landlocked Caspian Sea. Mongolia is almost part of this cluster too, being separated from Kazakhstan by only , across Russian or Chinese territory. There are the following "single" landlocked countries (each of them borders no other landlocked country): If the Caucasian countries and Kazakhstan are counted as part of Europe, then Europe has the most landlocked countries, at 20. If these transcontinental countries are included in Asia, then Africa has the most, at 16. Depending on
Boehm's gerbil the lower side white, apart from the terminal portion which is white all round, often with a small tuft of white hairs at the tip. Boehm's gerbil lives in a burrow with one or two entrances which it either digs itself or uses a pre-existing burrow of another gerbil species or a mole-rat. It is omnivorous, emerging at night to forage for vegetable material and insects, possibly over a large area. Breeding takes place at different times of year in different parts of its range, often coinciding with the rainy season. Boehm's gerbil Boehm's gerbil ("Gerbilliscus boehmi") is a species