Tlatar, Artificial pond and tourist site in Boyolali, Indonesia.

Tlatar is a 7-hectare spring-water site in Dukuh Tlatar, Kebonbimo, about 4 km north of Boyolali, fed by a spring that flows 24 hours a day from volcanic rock at roughly 350 m on the slopes of Mount Merbabu, with a discharge of 650 litres per second. It has two bathing pools, Umbul Pengilon and Umbul Asem, plus a fishing pond, children's and adult pools, a water park, a woodball court, lesehan restaurants and souvenir kiosks.

Tlatar is fed by a spring that flows continuously for 24 hours from a volcanic rock layer on the slopes of Mount Merbabu, at about 350 metres above sea level. The site covers 7 hectares and discharges 650 litres of water per second. It is managed as one of three flagship UPTD units of the Boyolali Tourism and Culture Office, together with Umbul Pengging and Pantaran.

Every two days before Ramadan, Umbul Tlatar hosts a Padusan, a ritual bathing event held to purify oneself before the fast; the same event takes place at Umbul Pengging and Pantaran. An entertainment stage is set up at the site ahead of the fasting month for performances such as music concerts.

The site is accessible during daylight hours with clearly separated zones for different activities and age groups. It is advisable to wear comfortable clothes and swimwear, and expect crowds during peak visiting times.

The spring feeding Tlatar discharges about 650 litres per second, continuously, from a volcanic rock layer on the lower slope of Mount Merbabu at roughly 350 metres above sea level. The 7-hectare site holds two bathing pools, Umbul Pengilon and Umbul Asem, and a woodball field.