Final answer:
Sevastopol and Yalta are located in Crimea, a peninsula in the Black Sea. Yalta is notably known for the Yalta Conference of World War II where Allied leaders discussed post-war Europe.
Step-by-step explanation:
Sevastopol and Yalta are both located in Crimea. Crimea is a peninsula in the northern part of the Black Sea. The region has been historically significant, especially in the context of military and political events. For instance, Yalta in Crimea was the site of the famous Yalta Conference during World War II in February 1945.
At this conference, leaders from the Allies met to discuss the post-war restructuring of Europe and negotiate terms for the end of the conflict, especially concerning the joint occupation of Germany and the future of Eastern European countries.