Slovenski je dio Jadranskoga mora njegov najsjeverniji dio koji obuhvaća oko 200 km2 i dio je širega Tršćanskog zaljeva. Slovenska obala prostire se na 47 km uglavnom strme, abrazijske obale od lapora i pješčenjaka. Niska akumulacijska obala nalazi se samo kod ušća vodenih tokova i čini manji dio, a najmanji dio pripada vapnenačkoj abrazijskoj obali. Kopneni obalni pojas uglavnom je brežuljkast i reljefno jako raščlanjen, a zaravni se nalaze u manjoj mjeri samo u donjim dijelovima riječnih dolina. Slovensko more ulazi u kopno s dva veća zaljeva, Koparskim i Piranskim, pa je stoga veoma plitko. Prosječna dubina je oko 18 m, a najveća je kod piranskog rta Madona. Dno mora većim je dijelom pokriveno sedimentima koji su posljedica abrazije strmih stjenovitih obala i akumulacije riječnih nanosa. Zbog plitkosti more je izloženo velikim temperaturnim kolebanjima, a zbog dotjecanja slatke vode i promjenama saliniteta vode. Kretanje morske vode u najvećoj je mjeri posljedica morske mijene i vjetrova, poglavito bure, koja značajno utječe na vertikalno kruženje vode. Strujanje je slabo i promjenljiva smjera. Erozijom zemlje i površinskim dotjecanjem oborina, vodenim tokovima i neposrednim ispuštanjem otpadnih voda u slovensko more dotječu mnogobrojne hranjive tvari. Posljedica je spomenutih obilježja velika pokrajinska osjetljivost ekosustava obalnoga mora. More se ljeti intenzivno ugrije i uz slabo kruženje vode česte su pojave nedostatka kisika u dubljim slojevima vode, intenzivnog rasta algi i cvjetanja, što upućuje na premašen kapacitet samočišćenja (asimilacijski) morskog ekosustava. Glavni su izvori zagađenja obalni gradovi Kopar, Izola, Piran i Portorož, nautički turizam s marinama, pomorski promet te lučka aktivnost Luke Kopar. Zbog ljudskih aktivnosti još uvijek se povećavaju pritisci na morski ekosustav, i na kopnu, i na moru, unatoč pojedinim mjerama smanjenja onečišćenja. Slovensko je obalno more, prema ocjeni Mediteranskog akcijskog plana (UNEP-MAP), zbog svojih oceanografskih značajki i utjecaja gospodarske djelatnosti, uvršteno među najosjetljivije i ugrožene dijelove Sredozemlja. Stanje okoliša slovenskoga dijela Jadranskoga mora nastojalo se predočiti pomoću modela DPSIR, odnosno dopunjenoga Integralnoga geografskog modela proučavanja okoliša i njegovih komponenti., Slovenian part of the Adriatic Sea is its most northern part which occupies approximately 200 km2 and is a part of the wider Gulf of Trieste. Slovenian coast consists of 47 kilometers of mostly steep, abrasive marl and sandstone coast. Low accumulation coast is located only at the mouths of the watercourses and represents but a smaller portion, whereas the smallest part is occupied by the limestone abrasion coast. Mainland coastal region is mostly hillside and has a very diverse relief, while plains, in smaller numbers, are located only in the lower parts of the river valleys. Slovenian sea indents the mainland by two larger gulfs: the Gulf of Koper and of Piran and is predominately very shallow. The average depth is around 18 m and the largest depth is 38 m at the Madona cape near Piran. Sea bottom is mostly covered by the thick layer of sediments deposited after the abrasion of the steep cliff coast and by the accumulation of the river alluvium. Due to its shallowness the sea is exposed to high temperature fluctuations and due to the fresh water influx also to the changes of its salinity. The circulation of the sea water is mainly induced by the tide and wind activities, mostly the Bora (strong north-easterly wind) which significantly influences the vertical circulation of the water. Water current is weak and unstable. There is a large influx of nutrients into the Slovenian sea, resulting from the soil erosion, surface water influx, watercourses and direct emissions of waste waters into the sea. The consequence of the mentioned sea characteristics is a great landscape sensitivity of the coastal sea ecosystem. During summer the sea warms intensely and when accompanied by the weak water circulation, we are often witnessing the lack of oxygen in the deeper layers of the water, intensive algae growth and sea blooming, which points to exceeded self-cleaning (assimilation) capacities of the marine ecosystem. The major polluters are the coastal towns of: Koper, Izola, Piran and Portorož, nautical tourism with marines, naval traffic and the port activity of the Luka Koper. The pressures on the marine ecosystem due to the human activities are still increasing, both on the mainland and in the sea, despite some measures to reduce the pollution. According to the assessment of the Mediterranean action plan (UNEP-MAP), Slovenian coastal sea is, due to its oceanographic characteristics and the economic activities influence, ranked among the most sensitive and endangered parts of the Mediterranean. Environmental state of the Slovenian part of the Adriatic Sea will try to be presented through the DPSIR model or the amended Integral Model of Geographical Study of the Environment and its Components.