Early European (primarily from England, Ireland and France) settlement in Newfoundland was confined to the coast. The rich cod fishery on the Grand Banks and along the shore of the island was the primary reason for these settlements. The rugged shoreline provided many small, but isolated, harbors (outports) from which to conduct the fishery. The Avalon Peninsula was, and is, the most populous part of the island, and as such had the best developed system of early roads and trails. Transportation between communities on other parts of the coast, especially the south coast between Fortune Bay and Port aux Basques, was exclusively by boat. Almost all communities are now accessible by roads which are part of the provincial road system. The now-defunct Newfoundland Railway, built in the latter part of the 19th century, and the development of the lead, zinc and copper mine at Buchans and the paper mill in Grand Falls in the early 20th century marked the beginning of the settlement of the interior of the island. Despite these developments the majority of the population is still found along the coast.