Why was the island of Salamis important to Athens and Megara?

The island of Salamis was a significant point of contention between Athens and Megara during the early 6th century BCE, serving as the focus of a protracted war for territorial possession.1

For the Athenians, the island became a matter of profound national honor and shame after they suffered repeated military failures against the Megarians. The conflict was so demoralizing that the Athenian government eventually forbade anyone from proposing that the war be resumed. The statesman Solon famously intervened by feigning madness and publicly reciting a poem that challenged his fellow citizens to reclaim the island, effectively shifting public sentiment and leading Athens to eventually secure control of Salamis. While the island later gained historical fame as the site of a decisive naval victory against the Persians in 480 BCE, its earlier importance was rooted in this intense regional rivalry and the restoration of Athenian prestige.123