land drained by a river and its tributaries

(a)  

to visualize or picture mentally

(a)  

an ideal or perfect place

(a)  

dense forest in a high-rainfall area

(a)  

to move upwards or increase

(a)  

to come into contact with

(a)  

to investigate or look around

(a)  

very small

(a)  

large body of saltwater

(a)