La Manga is a seaside spit separating the Mediterranean Sea from the Mar Menor lagoon, running 21 km (& 100m wide) from Cabo de Palos to the Punta del Mojón. It’s a popular visitor destination for the golf on La Manga and water sports in the Mar Menor (“small sea”). The best running in this area is the loop around Cape Pelos. 

Cape Pelos Loop

Cabo Pelos Path. Google Street View

The loop around Cape Palos is 5.6 km. The rocky Cape is very scenic, with its cliffs, caves, coves, and sea views. Starting from Cala Medina, run on the coastal path, Sendero Cabo Palos a Cala Reona/Po de la Barra, along the south side of the Cape. It’s a mainly gravel trail, with a couple of sections of paved promenade. There are nice water views. At Calafría Beach, you can take a jaunt out to the lighthouse (faro), and then wind around to the north end. The concrete path runs by a couple of coves, and then is a wider promenade along Playa de Levante. The last section is around a scenic marina. 

La Manga Running Options

The running on La Manga isn’t great. There’s one main road, Gran Vía de la Manga, which runs along the spit. It’s mainly interior, with a few scenic sections along the water. However, there is are separate cycle and pedestrian paths along the Gran Vía, so it’s runnable — just not that scenic. The nicest section is toward the northern end.