The island of Bali lies 3.2 km (2 mi) east of Java, and is approximately 8 degrees south of the equator. East to west, the island is approximately 153 km (95 mi) wide and spans approximately 112 km (69 mi) north to south; its land area is 5,632 km².

The highest point is Mount Agung at 3,142 m (10,308 feet) high, an active volcano that last erupted in March 1963. Mountains range from centre to the eastern side, with Mount Agung the easternmost peak. Mount Batur (1,717 m) is also still active; an eruption 30,000 years ago was one of the largest known volcanic events on Earth. In the south the land descends to form an alluvial plain, watered by shallow, north-south flowing rivers, drier in the dry season and overflowing during periods of heavy rain. The longest of these rivers, Sungai Ayung, flows approximately 75 km.

Bali island is surrounded by coral reefs. Beaches in the south tend to have white sand while those in the north and west have black sand. The beach town of Padangbai in the south east has both. Bali has no major waterways, although the Ho River is navigable by small sampan boats. Black sand beaches between Pasut and Klatingdukuh are being developed for tourism, but apart from the seaside temple of Tanah Lot, they are not yet used for significant tourism.

The principal city is the provincial capital and largest city, Denpasar, near the southern coast. Its population is around 300,000. Bali's second-largest city is the old colonial capital, Singaraja, which is located on the north coast and is home to around 100,000 people. Other important cities include the beach resort, Kuta, which is practically part of Denpasar's urban area; and Ubud, which is north of Denpasar, and is known as the island's cultural centre.

Bali is renowned for its diverse and sophisticated art forms, such as painting, sculpture, woodcarving, handcrafts, and performing arts. Balinese percussion orchestra music, known as gamelan, is highly developed and varied. Balinese performing arts often portray stories from Hindu epics such as the Ramayana but with heavy Balinese influence. Famous Balinese dances include pendet, legong, baris, topeng, barong, gong keybar, and kecak (the monkey dance). Bali boasts one of the most diverse and innovative performing arts cultures in the world, with paid performances at thousands of temple festivals, private ceremonies, or public shows.

Balinese art is art of Hindu-Javanese origin that grew from the work of artisans of the Majapahit Kingdom, with their expansion to Bali in the late 13th century. Since then, Ubud and its neighboring villages have been the center of Balinese art. Ubud and Batuan are known for their paintings, Mas for their woodcarvings, Celuk for gold and silver smiths, and Batubulan for their stone carvings.