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
Tarabul's gerbil length averages 102.9mm and the tail length averages 148.4mm. Tarabul's gerbil is found from northern Senegal, Mauretania, Western Sahara and Morocco east to Tibesti Mountains of Chad in the south and to Cyrenaica in eastern Libya in the north. The recently noted extension of its range into northern Senegal may be an indicator of increased desertification. Tarabul's gerbil occurs in sandy desert and semi-desert areas, as well as coastal steppe. Tarabul's gerbil is a nocturnal species that digs complex, shallow burrows (15–25 cm in length) in the sand and which plugs the entrance to its burrow during the day. It