let us start by picturing the Japan archipelago lying in the sea by the Chinese mainland. If its proximity allowed it to become part of the Sinosphere and acquire a written culture, its distance benefited the development of indigenous writing. The Dover Strait, separating England and France, is only 34 kilometers (21 miles) wide. A fine swimmer can swim across it. In contrast, the shortest distance between Japan and the Korean Peninsula is five or six times greater, and between Japan and the Chinese mainland, twenty-five times greater. The current, moreover, is deadly. . . . Japan's distance from China gave it political and cultural freedom and made possible the flowering of its own writing.
Minae Mizumura, The Fall of Language in the Age of English
geography, language, literature