Gastilonys is a former village in the Kaišiadorys District Municipality, Lithuania, located 1 kilometer south of Grabučiškės, on the right bank of the Kaunas Reservoir.
The Gastilonys Botanical-Zoological Reserve has been established in the village, where grows.
History The village used to be on the right bank of the Neman, east of . In 1959, Kaunas was flooded during the construction of the Kaunas Hydroelectric Power Plant, creating the Kaunas Reservoir.
Origin of the name The name of the village comes from the surname Gastila.Aleksandras Vanagas. Išnykę vietovardžiai. „Kauno marios“. Paruošė Lietuvos TSR paminklų apsaugos ir kraštotyros draugijos Kauno skyrius. – Vilnius, „Mokslas“, 1981. // psl. 83–86
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