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
Great gerbil and satellite images. Inhabited great gerbil burrows can be distinguished from abandoned burrows using satellite images . Great gerbils are known reservoirs of "Yersinia pestis", the bacterium that causes plague, and of "Leishmania major", the causative agent of zoonotic cutaneous leishmaniasis. They are also known as crop pests and have been implicated in exacerbating erosion. Great gerbil The great gerbil ("Rhombomys opimus") is a large gerbil found throughout much of Central Asia. The largest of the gerbils, great gerbils have a head and body length of . Their skulls are distinctive by having two grooves in each incisor. They have