. The geography of New Zealand. Historical, physical, political, and commercial . Port Waikato. north-west, passing through the high volcaniccountry of the Maungatautari in a deep gorge.issuing thence, it flows across the flat plain of themiddle Waikato basin, and passing through therange that bounds the basin on the north-west inthe Taupiri Gorge, reaches the flat country of thelower Waikato basin. It turns west in the volcaniccountry near Pukekohe Hill, and becoming veryshallow, finally enters the sea across a series of flatsandbanks. 134 GEOGRAPHY OF NEW ZEALAND The Mokau and Waitara flow w
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. The geography of New Zealand. Historical, physical, political, and commercial . Port Waikato. north-west, passing through the high volcaniccountry of the Maungatautari in a deep gorge.issuing thence, it flows across the flat plain of themiddle Waikato basin, and passing through therange that bounds the basin on the north-west inthe Taupiri Gorge, reaches the flat country of thelower Waikato basin. It turns west in the volcaniccountry near Pukekohe Hill, and becoming veryshallow, finally enters the sea across a series of flatsandbanks. 134 GEOGRAPHY OF NEW ZEALAND The Mokau and Waitara flow westwards, andreach the ocean somewhat to the north-east of MountEgmont. Both pass through country containingcoal seams, and are navigable for vessels of lightdraught.. /fana/hkei /?? /livers of West CoacK North /s/an</befmeer) Lat. 39. 30artd 40°. 303ndLony. 174°. 30anc/ I7C° 30 -fj. /. Trunk Railf^^y. Scats of miles The navigation of all rivers on the west coast ofNew Zealand is much impeded by the presence ofsand bars across their mouths. The sand is com-posed of the hardest and most resistant minerals ofvolcanic rocks, which have been worn to pieces by RIVERS OF NORTH ISLAND 135 the rivers and ocean. The most abundant of tliem ismagnetite—the magnetic oxide of iron—whencethese sands have been called magnetic ironsands.The formation of the sand bars across the rivermouths is a result of the combined action of heavyseas and of a sweeping oceanic current in anortherly direction. The heavy seas pile up the sandon the beach, and as some of the grains aremomentarily suspended in every breaking wave, they are carried along the coast by the onward move-ment of the water with the current. The series ofshort steps takes them across the river mon