The given question is based on observational and geographical interpretation. It requires an understanding of what a tidal port is - a port that is greatly affected by the variations of tides, which can influence the navigation and docking of ships.

Option 1, 2, and 3 aren`t the correct answers because the geographical location marked by these numbers on the map doesn`t meet the physical conditions to be considered as tidal ports. This could be due to the absence of significant tidal activities in these regions or because they aren`t even waterfront locations.

Option 4 is the correct answer because the location marked on the map exhibits compatible features to be a tidal port. It might be located near an ocean or sea where the tidal range is significant enough to affect maritime activities.

Without the actual map, a more detailed and specific explanation isn`t possible. The specific characteristics of a tidal port and how they apply to this particular location can only be precisely understood with the help of a map.