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
Botta's gerbil was first described by the French zoologist and herpetologist Fernand Lataste in 1882, he named it "Gerbillus bottai". It is known from a small number of locations in Sudan, between the Blue Nile and the White Nile to the south of Khartoum, with some possible sightings in northern Kenya. It may form part of a species complex alongside the Khartoum gerbil ("Dipodillus stigmonyx"), Harwood's gerbil ("Dipodillus harwoodi"), and Waters's gerbil ("Gerbillus watersi") . However, "D. harwoodi" has a separate range in Kenya about to the south of the other three species and further investigation may elevate it to full species