Ombai Strait
Slightly below baseline, on a route where slightly is a single ship.
Below normal −13% against its 2019–2023 baseline
Reading for — 6 days ago. Figures are a 30-day mean, so one quiet day does not move them.
Two years of daily transits
Month by month
| Month | Transits/day | vs baseline |
|---|---|---|
| October 2026 | 10 | −9% |
| September 2026 | 10 | −17% |
| August 2026 | 10 | −14% |
| July 2026 | 10 | −17% |
| June 2026 | 10 | −14% |
| May 2026 | 9 | −23% |
The 18 months before that
| Month | Transits/day | vs baseline |
|---|---|---|
| April 2026 | 9 | −20% |
| March 2026 | 9 | −21% |
| February 2026 | 10 | −14% |
| January 2026 | 9 | −19% |
| December 2025 | 10 | −12% |
| November 2025 | 10 | −10% |
| October 2025 | 12 | +0% |
| September 2025 | 11 | −2% |
| August 2025 | 10 | −10% |
| July 2025 | 10 | −10% |
| June 2025 | 11 | −1% |
| May 2025 | 10 | −14% |
| April 2025 | 10 | −12% |
| March 2025 | 11 | −6% |
| February 2025 | 10 | −13% |
| January 2025 | 10 | −11% |
| December 2024 | 11 | −3% |
| November 2024 | 12 | +4% |
Record high 13.8/day (February 2020), record low 8.5/day (May 2026), on the 30-day mean since January 2019.
Source
Daily transit counts derived from satellite AIS positions by IMF PortWatch, covering 2841 days from 1 January 2019.
Source: IMF PortWatch, https://portwatch.imf.org. PortWatch is published under IMF terms rather than CC BY 4.0, unlike the rest of the data on this site: the figures here are derived and transformed, and the underlying series is not republished.
Small numbers, honest numbers
Ombai runs through the eastern Indonesian archipelago and is one of the smaller routes on this board, carrying around ten transits a day. It is running a little under its 2019–2023 baseline and level with last year, close to the record low it set in May 2026.
The whole seven-year range spans about eight to fourteen transits a day.
Read the count, not the percentage
On a route this size a percentage is a fragile thing. A move of one vessel a day is close to ten percent, and the board’s language — “below normal” — is doing more work than the underlying change justifies. The count in the table above is the figure to trust.
This is why the board flags routes below five transits a day and refuses to build headline facts from them. Ombai sits above that line, but not far above it.
Where it sits in the archipelago
The higher-volume Indonesian passages are Lombok, Sunda and Makassar.