wooden birdwatching hut overlooking douro river estuary in vila nova de gaia, portugal

birdwatching preservation conservation biodiversity overlooking observation destination tranquility environment waterfront horizontal landscape cityscape buildings boardwalk peninsula ecosystem portugal offering estuario peaceful estuary walkway railing skyline reserve esturio wetland tourism iberian outdoor habitat natural wooden scenic nature travel europe summer autumn people serene douro river views urban porto local coast marsh sunny space vila nova gaia bird hide rope wood view copy hut day