Tidal flooding is threatening Indonesia’s coastal regions once again, with the Meteorology, Climatology, and Geophysics Agency (BMKG) warning that the phenomenon could occur between June 22 and July 2, 2025. The potential rob, or tidal flooding, is linked to the moon’s position and is expected to impact numerous coastal areas across the country.
BMKG’s Director of Maritime Meteorology, Eko Prasetyo, urged residents, particularly those in Indonesia’s coastal regions and port zones, to remain vigilant.
“There is potential for coastal flooding that could generally impact community activities around ports and coastal areas. This includes loading and unloading activities at ports, activities in coastal settlements, as well as salt farming and coastal fishery operations,” Eko stated in an official release on Monday (June 23, 2025).
He emphasized that the public must stay alert and well-prepared to mitigate the effects of rising sea levels. “The public is urged to remain alert and prepared to anticipate the impact of maximum sea tides. Please also stay updated with maritime weather information from BMKG through the BMKG Call Center 196 or by directly contacting the nearest BMKG office,” he added.
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According to Eko, two celestial events are contributing to the higher sea levels: the Perigee Phase, when the Moon is closest to Earth in its elliptical orbit, which will occur on June 23, 2025, and the New Moon phase on June 25, 2025. Both events are expected to elevate sea water levels significantly.
Based on tidal predictions and water level observations, BMKG identified several regions that may be affected by tidal flooding. These include:
- North Sumatra Coast
- Riau Islands Coast
- West Sumatra Coast
- Bangka Belitung Islands Coast
- Jambi Coast
- Lampung Coast
- Banten Coast
- Jakarta Coast
- West Java Coast
- Central Java Coast
- Yogyakarta Coast
- East Java Coast
- Bali Coast
- West Nusa Tenggara Coast
- East Nusa Tenggara Coast
- East Kalimantan Coast
- South Kalimantan Coast
- Central Kalimantan Coast
- West Kalimantan Coast
- North Sulawesi Coast
- Maluku Coast
- South Papua Coast
The BMKG continues to monitor the situation closely and advises coastal communities to remain cautious throughout the predicted period.
