Seagulls take flight near Rabelo boat on ramp next to Douro River, Porto

porto portugal seagulls flying rabelo boat ramp cais da ribeira vila nova de gaia coastal scene waterfront seaside bird behavior scenic view dockside maritime urban port river douro cityscape seabirds historic site nautical ripples coastal town boat embarkation seagull activity harbor area traditional vessel coastal charm tourist attraction quayside waterside scene oldworld charm vantage point maritime culture cultural heritage rabelo wine boat city landmark gastronomy sunset view relaxation travel destination scenic escape tranquil waters coastal lifestyle architectural beauty riverside ambiance idyllic scenery tourism travel