Zhè cì fēnghuì jùjíle Tàipíngyáng zhōubiān de zhǔyào jīngjìtǐ.
The summit gathered the major economies of the Pacific Rim.
Tips
usage
More commonly written as 环太平洋 (huán-Tàipíngyáng, 'around the Pacific'), e.g. 环太平洋经济合作 (Pacific Rim economic cooperation), 环太平洋火山带 (Pacific Ring of Fire). 太平洋周边 is the looser, news-style phrasing.