Related Clues:

• Squiggly shapes
• Mississippi quartet?
• More than a third of Mississippi
• Sassafras quartet
• 'Sissy,' mostly
• Assessment quartet
• Ends of sandwiches?
• Alpine curves
• Snaky shapes
• More than a third of Mississippi?
• Snake shapes
• Curvy turns
• Difficult road layouts
• States borders?
• Challenging curves