Tarzan the Terrible by Edgar Rice Burroughs

Tarzan and Jane skirted the shore of Jad-bal-lul and crossed the river at the head of the lake. They moved in leisurely fashion with an eye to comfort and safety, for the ape-man, now that he had found his mate, was determined to court no chance that might again separate them, or delay or prevent their escape from Pal-ul-don. How they were to recross the morass was a matter of little concern to him as yet -- it would be time enough to consider that matter when it became of more immediate moment. Their hours were filled with the happiness and content of reunion after long separation; they had much to talk of, for each had passed through many trials and vicissitudes and strange adventures, and no important hour might go unaccounted for since last they met.

It was Tarzan's intention to choose a way above A-lur and the scattered Ho-don villages below it, passing about midway between them and the mountains, thus avoiding, in so far as possible, both the Ho-don and Waz-don, for in this area lay the neutral territory that was uninhabited by either. Thus he would travel northwest until opposite the Kor-ul-ja where he planned to stop to pay his respects to Om-at and give the gund word of Pan-at-lee, and a plan Tarzan had for insuring her safe return to her people. It was upon the third day of their journey and they had almost reached the river that passes through A-lur when Jane suddenly clutched Tarzan's arm and pointed ahead toward the edge of a forest that they were approaching. Beneath the shadows of the trees loomed a great bulk that the ape-man instantly recognized.