[3] The nearest island is Kalamos, with a deep channel between them; the mainland is approximately 5 kilometres (3 miles) to the northeast in Aetolia-Acarnania.

During the summer Kastioti of the diaspora return for holidays and together with the fluctuating visitors arriving on yachts, form its seasonal character.

The area is 5.901 square kilometres (2.278 sq mi)[4] and its highest point is 142 metres (466 feet) over the Mediterranean Sea level.

Agios Ioannis church is decorated with wall paintings from the notable Eptanesian painter Spyridon Gazis.

The island has a range of facilities such as a mini-market, three bars, four restaurants and a small gift shop.