Geography of the European Netherlands European part of the country can be split into two areas: the low and flat lands in the west and north, and the higher lands with minor hills in the east and south. The former, including the reclaimed polders and river deltas, make up about half of its surface area and are less than above sea level, much of it actually below sea level. An extensive range of seawalls and coastal dunes protect the Netherlands from the sea, and levees and dikes along the rivers protect against river flooding. The rest of the country is mostly flat; only in the
Voyage to the Bottom of the Sea series encouraged Irwin Allen to produce other science fiction television shows. The most notable of these shows were "Lost in Space", "The Time Tunnel", and "Land of the Giants". The success of the feature film led to the 1964–1968 television series on ABC, "Voyage to the Bottom of the Sea". During the series run, the film's storyline was remade as a one-hour episode. That episode was written by Willam Welch and was titled "The Sky's on Fire". Other scenes in the film were also rewritten and incorporated into the television series. In June 1961, Pyramid Books published a novelization of