headstream 
noun
A headwater stream.‘Waitanyuan’ means literally ‘the headstream of the Bund’ and is centred at the confluence of Suzhou Creek and the Huangpu River....
- It is for this reason that Seurat, along with Cézanne, stands as the great renovator at the headstream of modern painting.
- South-east of the Andes, plains of rich pasture stretch away to the east and to the south, where the land falls in forested terraces towards the headstreams of the Amazon.
- pitch note
- pitch of the ball
- pitch-oil
- pitch opal
- pitchout
- pitch-penny
- pitch-perfect
- pitch phoneme
- pitch pine
- pitch pipe
- pitch-plaster
- pitch point
- pitchpole
- pitch polisher
- pitch pot
- pitch shifter
- pitch shot
- pitchside
- pitch someone/thing against
- pitch something up (or pitch up)
- lead the way
- lead time
- lead-up
- lead up to
- Leadville