What physical feature which lies between two large bodies of water, is the northern border to the muslim empire? ?

The Caucasus Mountains lay between the Black Sea and the Caspian Sea. By the 639, the Arabs invaded the region of what today is known as Azerbaijan and Dagestan (Russia). The Caucasus served as a border between the Muslim Empire and the Turkic Khazar Empire.

explanation:

hitler's  "rise" can be considered to have ended in march 1933, after the reichstag adopted the enabling act of 1933 in that month. president paul von hindenburg had already appointedhitler  as chancellor on 30 january 1933 after a series of parliamentary elections and associated backroom intrigues.