Sea level as a dial
Lower the sea and the continents join one strait at a time. At 43 meters down, the Americas meet Afro-Eurasia across the Bering Strait.
The relief is measured: ETOPO1, the Earth’s surface at every arc-minute. The landmasses are derived by a stated rule, cells dried from the highest down and joined where they touch, and the rule finds the largest single step at −43 m, at Bering. The level is one sea for the whole globe, dated off the glacial curve, so a strait’s own record can differ by centuries.
Relief: ETOPO1, NOAA (public domain). Sea level by date: Lambeck et al. 2014, and before 35,000 years ago Spratt & Lisiecki 2016. People: AADR v66.