Given the task definition and input, reply with output. Given a sentence and two mentions from the text (arguments), indicate a phrase (a verb or noun phrase) that describes the relationship between the provided arguments.

Sentence: 'The Xinjiang Uighur Autonomous Region in China is region that has been an important site for the interaction of European , South Asian , Central Asian , and East Asian civilizations , and hence an extremely significant region for understanding world history .', Argument/Subject 1: 'xinjiang', Argument/Subject 2: 'china'
be region in