The Bernam runs through flat swampy country for the greater part of its course, and steam-launches can penetrate to a distance of over 100 m.
The harbour of Port Blair is well supplied with buoys and harbour lights, and is crossed by ferries at fixed intervals, while there are several launches for hauling local traffic. On Ross Island there is a lighthouse visible for 19 m.
Holland is a grain and fruit shipping centre, and among its manufactures are furniture, leather, grist mill products, iron, beer, pickles, shoes, beet sugar, gelatine, biscuit (Holland rusk), electric and steam launches, and pianos.
Dagupan has a small shipyard in which sailing vessels and steam launches are constructed.
Steam launches did not exist on the river before 1866 or 1867, and houseboats only in the form of college barges at Oxford.
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