ABSTRACT Crocodile’s ecology, conservation and management in the Ruzizi Delta were investigated during the period from April 2019 to April 2021 by interviews using a survey questionnaire, and by direct observation using binoculars during the day, and at night on the secure coastline of Lake Tanganyika between the mouth of the Small Ruzizi River and the mouth of the Kalimabenge River. The investigations were part of a doctoral research aimed at the creation of a Community Reserve in the Ruzizi Congolese Delta and at the conditions improvement for birds, crocodiles and lasting biodiversity conservation in the Rusizi Burundian Delta. The average density of the Nile crocodile, Crocodylus niloticus (Laurenti, 1768) was higher in the protected Rusizi Burundian Delta (19 crocodiles/ km2) and lower in the unprotected Ruzizi Congolese Delta (6 crocodiles/ km2). Similarly, the density of the Slender-snouted Crocodile (Mecistops leptorhynchus) was higher in the protected Rusizi Burundian Delta (40 crocodiles/ km2) and lower in the unprotected Ruzizi Congolese Delta (11 crocodiles/ km2). The Ruzizi Congolese wetland stakeholders accepted (90%) the protection of the Ruzizi Congolese wetlands as a Ruzizi Congolese Community Reserve to be submitted later to the Ramsar Secretariat for designation as a Ruzizi Congolese Ramsar Site. The sustainable management of crocodiles and biodiversity will require the formulation of joint conservation projects by the Authorities of the Ruzizi Congolese Delta and the Rusizi Burundian Delta. Key words - Crocodile’s Ecology; Conservation and Management; Ruzizi Congolese Delta; Rusizi Burundian Delta; Crocodile’s density. References Alexander, G., & Marais, J. (2007). A Guide to the Reptiles of Southern Africa. Cape Town, Antoine, A.-A. (2019). The Student’s t-Test: A Brief Description, Short Communication. Research & Reviews: Journal of Hospital and Clinical Pharmacy, Buies Creek USA, 3 pages.https:www.researchgate.net/The_Student%27s_t-Test 30/10/2021, 3. BAD, & DPRC. (1995 ). Rapport d’achèvement du Projet Rehabilitation et Extension du Complexe Sucrerie de Kiliba Zaïre. Kinshasa-RDC: BAD (Banque Africaine de Développement) & DPRC (Département par Pays Région Centre), 83 pages. https://www.afdb.org/fileadmin/uploads/afdb/ 20/10/2021. Bank, W. (2018). Lake Tanganyika Environmental Management Project (P165749), Project Information Document/ Integrated Safeguards Data Sheet (PID/ISDS). Washington DC, USA: Public Disclosure Authorized, 21 pages. http://www.worldbank.org/projects 02/11/2021. Bashonga, B. A. (2019). Public Awareness on tne Reauction of Threats to Crocodiles and Hippopotami in the Ruzizi Plain and the Lake Shore in Uvira DRC, Northern End of Lake Tanganyika. CEBioS, Buxelles. http://cebios.naturalsciences.be 07/10/2021, 4 pages. Bobby, V. (2018). Hampi - Valley of the Kings - documentary about wildlife conservation in India. SubstantialFilmsLtd. https://www.youtube.com/playlist?list 10/10/2021, 50 videos. CFAC, & FOPROCONA. (2019). Une dimension regionale pour la conservation et la gestion durable des ecosystemes forestiers. . CFAC (Commission des forets d’Afrique Centrale) & FOPROCONA (Forum Provincial sur la Conservation de la Nature). https://www.comifac.org/documents/rapports.pdf 02/11/2021, 13 pages. Corillon, J. M., & Jeannita, R. (2004). Reportage sur la découverte du monstre du lac Tanganyika, le Crocodile Gustave. Gédéon Programmes. https://ici.radio-canada-ca/2004/05-2004/16tanganyika.html 10/10/2021, 1 page. CORNEJO, A., YADIRA, G.-H., GRACIELA, G.-Á., CARLOS, G.-R., RAÚL, U., & ALEJANDRO, V. (2021). Perception and popular knowledge on crocodiles in the “Área de Protección de Flora y Fauna Manglares de Nichupté”, Quintana Roo, Mexico. Acta Zoologica Mxicana(nueva series), 37, 1-14. http://doi.org/10.21829/azm.2021.3712258, 15 pages. CSG. (2018). Crocodile Specialist Group Steering Committee Meeting Universidad Nacional del Litoral. Buenos Aires. http://www.iucncsg.org 07/10/2021: Santa Fe, Argentina (6 May 2018). Agenda Item: SC. 2.2, 11pages.