Canggu proper is a small village on the beach about 20 minutes north of Seminyak, half way to Tanah Lot. Canggu is widely used though to refer to a large coastal stretch of about 8 km, running north from the village of Berawa (just north of Seminyak) to the village of Cemagi (just south of Tanah Lot) taking in Echo Beach, Seseh and Pererenan along the way. It is still a largely rural area away from the beaches, but is being developed fast.
The beaches have dark grey or black sand and are not particularly good for swimming, but do offer some renowned and challenging surfing spots. wikivoyage.org