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 status. Botta's gerbil is a small species with sandy-brown upper parts with a blackish sheen, especially at the mid-line, and pure white underparts and limbs. The long tail is slightly bi-coloured, with dark hairs above and pale hairs below, the hairs at the tip forming a small tuft or pencil. Botta's gerbil Botta's gerbil ("Dipodillus bottai") is a species of gerbil endemic to Sudan and possibly northern Kenya. According to the International Union for Conservation of Nature, it was listed as Least Concern in 1996 until it was listed as Data Deficient in 2004. According to a 2013 book, it