Sunda Strait
A fifth above baseline, and slightly off its January peak.
Above normal +22% 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 | 33 | +20% |
| September 2026 | 33 | +19% |
| August 2026 | 32 | +19% |
| July 2026 | 32 | +18% |
| June 2026 | 32 | +18% |
| May 2026 | 35 | +27% |
The 18 months before that
| Month | Transits/day | vs baseline |
|---|---|---|
| April 2026 | 35 | +26% |
| March 2026 | 33 | +22% |
| February 2026 | 36 | +32% |
| January 2026 | 36 | +30% |
| December 2025 | 35 | +27% |
| November 2025 | 32 | +17% |
| October 2025 | 30 | +9% |
| September 2025 | 33 | +20% |
| August 2025 | 33 | +19% |
| July 2025 | 33 | +22% |
| June 2025 | 32 | +16% |
| May 2025 | 32 | +19% |
| April 2025 | 29 | +7% |
| March 2025 | 30 | +9% |
| February 2025 | 31 | +14% |
| January 2025 | 33 | +20% |
| December 2024 | 34 | +25% |
| November 2024 | 33 | +19% |
Record high 36.5/day (February 2026), record low 21.8/day (June 2019), 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.
Up on the long run, flat on the year
Sunda separates Java from Sumatra and is one of the three main ways through the Indonesian archipelago. It runs about a fifth above its 2019–2023 baseline — but level with where it was a year ago, and slightly below its record high of January 2026.
That pair of readings describes a route that rose at some point in the past few years and then settled, rather than one that is still climbing.
Read alongside its neighbours
Sunda and Lombok are alternatives for much the same traffic. Sunda is up on its baseline; Lombok is exactly level with its own. Both are small enough in absolute terms that the difference is a handful of vessels a day.
The 2022 step
The largest single-month move in the record is August 2022, from 24 a day to 29 — close to a quarter, on a route where a quarter is five ships. This page reports the percentages because they are how the board compares routes, but on a passage this size the underlying count is the more honest number, and it is in the table above.