Where did sushi as we know it today develop?

Sushi in its modern form developed in Japan, with major refinement in Edo during the 19th century. The hand-pressed style called nigiri-zushi became popular as a fast, convenient food in a growing city. Earlier fermented fish-and-rice traditions existed in Southeast Asia and Japan, but contemporary sushi is strongly associated with Japanese cuisine. Tokyo remains one of the key places for sushi culture and innovation.