Seika is located at the extreme southwestern tip of Kyoto Prefecture, bordered by the Kizu River to the east and the Keihanna Hills to the west.

Due to its position adjacent to the Kizu River, the eastern part of Seika has rich, fertile land ideal for agricultural production.

Seika has a humid subtropical climate (Köppen Cfa) characterized by warm summers and cool winters with light to no snowfall.

Beginning in the 1960s, Seika has experienced rapid growth as commuters to Kyoto, Osaka and Nara move into the town.

Seika, collectively with the other municipalities of Sōraku District and the city of Kizugawa, contributes two members to the Kyoto Prefectural Assembly.

Although largely agriculturally based, has in recent years become the center of a national project, the Kansai Science City, and has been referred to as the "New Culture Capital" of Japan.

Nippon Telegraph and Telephone Corporation (NTT), Matsushita Electric, Kyocera and many other companies have facilities in the town.The town is home to the Kansai-kan of the National Diet Library.

Another well-known event is the Igomori Festival, which dates back to 770 A.D. and features a large, blazing torch being carried through the darkness of the night.