lake of gruyere with ruins castle of pont (or pont-en-ogoz) and a chapel on the ile d'ogoz, fribourg, switzerland

low water level islet swiss switzerland lac walkway turquoise oguz green top view hight ile daoguz gruyauml island ruins reservoir fribourg landscape alpine castle sky panorama snow fields forest mountains alps europe lake gruyere pont pont-en-ogoz chapel located d'ogoz canton