The cleanest beach logic is simple. Monolithi is the big nearby sandy move, Kastrosykia and the Loutsa side of Vrachos-Loutsa are the easier family defaults, and Kanali is where you can keep the swim but shift the mood toward stronger beach-bar energy.
Monolithi is the big default beach from Preveza, with different local entry points putting it roughly 8 to 16 km from the center. Local tourism pages describe the full sandy stretch from Mytikas to Kastrosykia as about 25 km and market it as one of the longest sandy beaches in the European Union. That is useful local context, but it is not the same as saying it is the largest coastline in Europe.
Monolithi gives you width, freedom and endless room to spread out, so almost any stop still lets you swim. The practical caution is that some parts are more exposed and the water can deepen faster than the calmer family defaults farther north, especially once the afternoon wind picks up.
Kastrosykia sits about 20 km from Preveza and works well when the priority is children and relaxed swimming. Travel Preveza describes it as a family favorite with gradually deepening water and usually calmer sea, which makes it easier than more exposed beach entries.
Kanali is about 14 km from the center and keeps the same long sandy logic, but with a livelier beach-bar feel. If you want the more upbeat stop, Mango Beach Bar is the obvious name to save in Kanali. Its official site describes it as one of the larger beach bars in Epirus. Public phone listed on the official site: +30 6942 597194.
Vrachos-Loutsa is the longer southbound move, around 38 km from Preveza. Travel Preveza describes the Loutsa side as shallower and especially good for families with children, while the full six-kilometer beach gives you enough room to choose between calmer and livelier stretches.
For a more active family stop, your local note is useful: Vrachos is the side to remember when the children want the inflatable-water setup, with Splish Splash as the name to save there. That makes Vrachos-Loutsa useful not only as a swim beach, but as a more eventful family day.
This whole coast works because the beach rhythm stays generous for kilometers. In practice, that means you do not need to obsess over a single exact spot. Use Monolithi for the near and wide sandy stretch, Kastrosykia or Loutsa for the safer child-first default, and Kanali when the beach-bar mood matters more.
Near and wide usually means Monolithi. Child-first usually means Kastrosykia or the Loutsa side. More energy usually means Kanali and Mango. The coast is long enough that you can still swim almost anywhere once the radius is right.
Get occasional updates as the Preveza beach guide expands.