Related Clues:

• Ear part
• Missouri, e.g.
• Hudson, e.g.
• See 11-Down
• Martian feature
• See 51-Across
• See 16-Across
• Snake, for one
• See 35-Down
• Part of a network, often
• Water under the bridge
• Tributary
• Navigational aid
• See 32-Across
• Banks hold it