The theme of World Environment Day 2021 is World Environment Day. World Environment Day is celebrated on June 5th all over the world through various activities and campaigns with the aim of drawing public attention to numerous environmental problems and the need to preserve the environment. On that day in 1972, the UN General Assembly adopted a joint Programme of International Cooperation for the purpose of environmental protection. On this day, numerous activities are launched around the world that involve the public and encourage and promote a responsible attitude towards the environment. The Project for the Protection of Biodiversity and Water of Lake Palić and Lake Ludaš “ECOLACUS” is being implemented in Subotica. An integrated approach to the implementation of this Project enables the restoration of balance in the disturbed ecosystem of Lake Palić and Ludaš. It is valuable and is financed by a donation from the German Development Bank (KfW). The attached document briefly outlines the effects of the implementation of the ECOLACUS Project within the scope of the activities of the Public Enterprise “Water Supply and Sewerage” Subotica and the Public Enterprise “Palić – Ludaš”, which should formally be completed by the end of this year, 2021. years. Our community remains tasked with preserving and improving the values of the recovered ecosystem of Lake Palić and Ludaš, so that its degradation does not occur again. Attached file: Effects of the ” Ecolacus ” project