Tromejnik is a geodetic point on the triple border between Slovenia, Austria and Hungary. It is located at the top of a small hill near the village of Trdkova in the Goričko landscape park. The triple boundary stone was placed on the present site in 1924. The circular route from the large parking lot at the foot of the hill is an easy and interesting excursion in nature, as it follows a forest learning trail. At the top there are benches, a monument and information boards.