Solway Firth (UK) relative sea levels were 3.25 – 4 m higher than today from ~7000 to 5500 years ago before declining to present over the last few millennia (Hanan et al., 2026).

The reconstruction coring sites were located up to ~3 km inland from the modern coast.

New research also indicates Western Scotland’s relative sea levels were 4 to 5 m above present during the Mid-Holocene before declining to modern levels (Selby et al., 2026).

Image Source: Hanan et al., 2026

Image Source: Selby et al., 2026