the star on the following map is pinpointing what geographical feature?
a).the caucasus mountains
b).the caspian sea
c).the ural mountains
d).the sayan mountains

The star on the map is not pinpointing any geographical feature of the list, since it is located in Finland, but none of the features is located on that country.

Explanation:

A- The Caucasus is a mountain range located between the Black Sea and the Caspian Sea. The Caucasian mountain area is spreading in Russia, Georgia, Armenia, Turkey, Iran and Azerbaijan.

B- The Caspian Sea is an endorheic lake, as it has no outflows, and is located on the border between Asia and Europe, between Iran, Azerbaijan, Russia, Kazakhstan and Turkmenistan.

C- The Ural Mountains are an approximately 2,500 kilometers long mountain range in Russia. The Urals also form the border between Europe and Asia. Approximately 3% of Russia's population lives in the mountain range.

D- The Sayan Mountains are a mountain area in Siberia.  The region consists of two parts, the lower West Sayan (up to 2,930 meters) and the higher East Sajan (up to 3,492 meters). The area extends from Altaj in the west to Lake Baikal and Mongolia in the east. To the north it joins the Central Siberian Highlands.

the density would be a smaller number.