This document discusses definitions of Europe's boundaries. It notes that Europe's eastern boundary is commonly defined as the Ural Mountains, while its southeastern boundary with Asia is less clearly defined, possibly being the Ural River, Emba River, or Caucasus Mountains. The Mediterranean Sea separates Europe from Africa, and the Atlantic Ocean separates Europe from North America. However, there are differing opinions on where boundaries fall. Some include parts of Western Asia like Turkey and the Caucasus region within Europe, while others define boundaries along geographic features. The document also lists some transcontinental countries located in both Europe and Asia.