Primarily settling places of civilisations are the waterfront places in urban areas. While becoming effective also at defining urban identity, waterfront areas are proper and qualitative places for cities from the aspect of the opportunities they provide and their contributions to socialisation. Waterfront features provide people opportunities in these areas for different needs and activities. The relationship between cities and waterfront areas has stopped from time to time due to the effects of various dynamics. This study aims to put forward that functional value of the place is an important indicator as physical and perceptual features at determining the permeability level of waterfront parks. This research was conducted in two seaside parks of Trabzon, Turkey with 82 participants by using the semantic differentiation scale. Permeability parameters were obtained by questioning for 40 photographs by 21 adjectives qualifying the physical, functional and perceptive features chosen as the determinants of permeability. The results reveal that functional features of the place are important factors for waterfront parks and permeability can be defined together with physical, functional and perceptual features.