Vocabulary consisting only from characters you are able to read
上る
noboru
(1)to rise, to go up, to come up, to ascend, to be raised, (2)to enter (esp. from outdoors), to come in, to go in, (3)to enter (a school), to advance to the next grade, (4)to get out (of water), t godan, jlpt3, verb, vintrans
人波
hitonami
surging crowd, wave of humanity, stampedemix
大の字に
dainodžini
sprawled, spread-eagled, in the shape of the "dai" kanjimix
水力
suirjoku
hydraulic power, water powermix
山
jama
mountain, pile, heap, climax, critical pointjlpt5, shizen